15685990740 has 576 divisors, whose sum is σ = 61294060800. Its totient is φ = 3309465600.

The previous prime is 15685990693. The next prime is 15685990753. The reversal of 15685990740 is 4709958651.

15685990740 is a `hidden beast` number, since 1 + 5 + 6 + 8 + 599 + 0 + 7 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 20611960 + ... + 20612720.

It is an arithmetic number, because the mean of its divisors is an integer number (106413300).

Almost surely, 2^15685990740 is an apocalyptic number.

15685990740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15685990740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30647030400).

15685990740 is an abundant number, since it is smaller than the sum of its proper divisors (45608070060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15685990740 is a wasteful number, since it uses less digits than its factorization.

15685990740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 15685990740 in words is "fifteen billion, six hundred eighty-five million, nine hundred ninety thousand, seven hundred forty".